Replace device_sensor browsertest by service unittest.

services/device/device_service_test_base.h

Index: services/device/device_service_test_base.h
diff --git a/services/device/device_service_test_base.h b/services/device/device_service_test_base.h
index 4df7d1ea4549a6bc14d7cf9410be9c273306e84f..379f463364bcf6b631c8b5273a9d3042b7f3b1cc 100644
--- a/services/device/device_service_test_base.h
+++ b/services/device/device_service_test_base.h
@@ -6,6 +6,8 @@
 #define SERVICES_DEVICE_DEVICE_SERVICE_TEST_BASE_H_
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"

[Reilly Grant (use Gerrit), 2017/04/18 19:36:18]

This header is unused.

[ke.he, 2017/04/19 06:49:01]

It should be moved into device_service_test_base.cc.
Done.

+#include "base/threading/thread.h"
 #include "services/service_manager/public/cpp/service_test.h"
 
 namespace device {
@@ -20,6 +22,8 @@ class DeviceServiceTestBase : public service_manager::test::ServiceTest {
   // service_manager::test::ServiceTest:
   std::unique_ptr<service_manager::Service> CreateService() override;
 
+  base::Thread io_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(DeviceServiceTestBase);
 };